4 results about "Cutting force" patented technology

The invention provides a method for extracting a drum load spectrum of a cutting unit of a drum shearer. The method comprises the steps of obtaining a coal rock occurrence condition of a rock sample of a coal rock; testing a stress condition of a single cutting tooth of a drum of the cutting unit of the shearer to obtain a mean load model of the single cutting tooth; randomizing the mean load model of the single cutting tooth to create a cutting load random theoretical model of the single cutting tooth; according to the cutting load random theoretical model of the single cutting tooth, superposing three-way cutting force of the single cutting tooth to obtain a drum load spectrum model of the cutting unit of the drum shearer; and performing transient response analysis on each part of the drum according to the drum load spectrum model of the shearer to obtain a load spectrum of each position of each part of the drum. According to the method, random load models of the single cutting tooth are superposed to obtain random three-way force and three-way moment in the mass center of the drum, so that load input bases can be provided for subsequent calculation, analysis, optimization design and the like of a transmission system of the cutting unit of the shearer.

Disclosed is a machine tool cutting force simulation loading device so as to mainly solve the problems that prior machine tool cutting force simulation loading devices are complicated in structure, small in load and not suitable for experimenting on large high-speed numerically-controlled machine tools. The device is characterized in that the outside of a loading mandrel (4) is connected with a radial bearing sleeve (15) through rolling bearings B (18), a rotary element (16) is arranged on the outside of the radial bearing sleeve (15), a radial hydraulic cylinder (11) is arranged in a groove of the rotary element (16), a piston rod of the radial hydraulic cylinder (11) abuts against the outer surface of the radial bearing sleeve (15), and the rotary element (16) is connected with a servo motor (6) through a belt (8). An axial bearing sleeve (12) is arranged at the right end of the loading mandrel (4), and an axial hydraulic cylinder (13) is arranged in the axial bearing sleeve (12). The device has the advantages of being simple in structure, large in load range and applicable to machine tools of various types.

The invention discloses a finish turning method for the external circular surface of a thin-walled gear ring in the technical field of thin-walled gear ring machining. The method specifically comprises the following steps that S1, a main fixture body is clamped in an inner hole of the thin-walled gear ring workpiece to make the thin-walled gear ring workpiece be fixed and transmit cutting force ina fixture; S2, after the thin-walled gear ring workpiece is fixed, a turning tool with the tool cutting edge angle of 75-90 degrees is selected to conduct external circular rough turning on the thin-walled gear ring workpiece; S3, then the thin-walled gear ring workpiece is subjected to external circular finish turning, and a turning tool with the front rake angle of 15-30 degrees is selected forcutting; S4, after finish turning is completed, a cutting part is polished. According to the method, by adopting a reasonable cutting amount and cutting tools, cutting heat of the workpiece in the cutting process is eliminated; meanwhile, by adopting the cutting tool with the large tool cutting edge angle, the radial stress of the workpiece can be reduced, the cutting vibration and the deformation of the workpiece are reduced accordingly, and the dimensional precision, tooth profile precision and surface roughness of the external circular surface of the workpiece can be improved.

The invention discloses a turning and grinding tool for inner holes of a bearing seat. The turning and grinding tool comprises a connecting flange plate, further comprises V-shaped iron fixed on the connecting flange plate, and further comprises a pressing plate. One side of the V-shaped iron is tightly attached to the connecting flange plate, and the other side of the V-shaped iron is provided with a V-shaped downward-sunken structure; the bearing seat is placed in the downward-sunken structure of the V-shaped iron; and the pressing plate is fixed to the connecting flange plate and fixes thebearing seat to the position between the V-shaped iron and the pressing plate. According to the turning and grinding tool, turning and grinding are adopted jointly, a bearing seat bulged key is reliedfor positioning, the slopes of the two sides of the bearing seat are relied to serve as compressing faces, in the machining process, the peripheries of the holes are not affected by clamping force and cutting force, and after the workpiece is unloaded, the bearing holes do not deform.